package com.yisu.expressway.ui.recyclerview;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.yisu.expressway.utils.DisplayUtil;


/**
 * Created by theodore_hu on 2016/2/2.
 */
public class DividerListItemDecoration extends RecyclerView.ItemDecoration {

    private static final int[] ATTRS = new int[]{
            android.R.attr.listDivider
    };

    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;

    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;

    private Drawable mDivider;

    private int mOrientation;
    private int mDividerSize = 0;
    private HFRecyclerViewAdapter mHFAdapter;
    private Paint mPaint ;


    /**
     * 默认一个像素宽度分割线
     * @param context 上下文
     * @param orientation 列表方向
     */
    public DividerListItemDecoration(Context context, int orientation) {
        setOrientation(orientation);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG) ;
        mPaint.setColor(0xefeff4);
        mPaint.setStyle(Paint.Style.FILL);
        mDividerSize = 1;//DisplayUtil.dip2px(context,dividerWidth);
    }


    /**dividerWidth is dp**/
    public DividerListItemDecoration(Context context, int orientation, int dividerWidth) {

        setOrientation(orientation);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG) ;
        mPaint.setColor(0xefeff4);
        mPaint.setStyle(Paint.Style.FILL);
        mDividerSize = DisplayUtil.dip2px(context,dividerWidth);
    }

    /**divider width is dp**/
    public DividerListItemDecoration(Context context, int orientation, int dividerWidth, int colorId){
        setOrientation(orientation);
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG) ;
        mPaint.setColor(context.getResources().getColor(colorId));
        mPaint.setStyle(Paint.Style.FILL);
        mDividerSize = DisplayUtil.dip2px(context,dividerWidth);
    }

    public void setOrientation(int orientation) {
        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
            throw new IllegalArgumentException("invalid orientation");
        }
        mOrientation = orientation;
    }

    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {

        if (mOrientation == VERTICAL_LIST) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }

    }

    public void drawVertical(Canvas c, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getWidth() - parent.getPaddingRight();

        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int top = child.getBottom() + params.bottomMargin;
            final int bottom = top + mDividerSize;
            c.drawRect(left,top,right,bottom,mPaint);
//            mDivider.setBounds(left, top, right, bottom);
//            mDivider.draw(c);
        }
    }

    public void drawHorizontal(Canvas c, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getHeight() - parent.getPaddingBottom();
        final int childCount = parent.getChildCount();
        for (int i = 0; i < childCount; i++) {
            final View child = parent.getChildAt(i);
            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
                    .getLayoutParams();
            final int left = child.getRight() + params.rightMargin;
            final int right = left + mDividerSize;
            c.drawRect(left,top,right,bottom,mPaint);
//            mDivider.setBounds(left, top, right, bottom);
//            mDivider.draw(c);
        }
    }

    private boolean isLastColum(int pos,int childCount)
    {
        if((pos + 1) == childCount){
            return true;
        }
        return false;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {

        int childCount = parent.getAdapter().getItemCount();
        int itemPosition = parent.getChildAdapterPosition(view);

        if(parent.getAdapter() instanceof HFRecyclerViewAdapter){
            if(mHFAdapter == null) {
                mHFAdapter = (HFRecyclerViewAdapter) (parent.getAdapter());
            }
            childCount = mHFAdapter.getItemCount();
        }

        if(mHFAdapter != null) {
            if (mHFAdapter.hasHeader() && itemPosition == 0) {
                outRect.set(0, 0, 0, 0);
                return;
            }
        }

        if (isLastColum(itemPosition,childCount)) {
            outRect.set(0, 0, 0, 0);
        } else {
            if (mOrientation == LinearLayoutManager.VERTICAL) {
                outRect.set(0, 0, 0, mDividerSize);
            } else {
                outRect.set(0, 0, mDividerSize, 0);
            }
        }
    }

}
